import { v4 as uuidv4 } from 'uuid'
// 生成一个随机字符串 且每次执行不发生变化(不会重复)，游客身份持久存储
export const getUUID = () => {
    // 先从本地存储获取uuid 
    let uuid_token = localStorage.getItem('UUIDTOKEN');
    if (!uuid_token) {
        // 生成游客临时身份
        uuid_token = uuidv4();
        // 本地存储uuid
        localStorage.setItem('UUIDTOKEN', uuid_token);
    }
    // 返回uuid_token
    return uuid_token;
}
